# Codebook for mms_merged_harmonized_panel_cleaned4reg_4digit.dta

## Dataset Overview
- Number of Observations: 1,760
- Number of Variables: 27

## Variable Descriptions

### `code`
- **Description**: Industry Code
- **Type**: String

### `year`
- **Description**: Year
- **Type**: Numeric (integer)

### `id`
- **Description**: Unit ID
- **Type**: Numeric (integer)

### `post`
- **Description**: Post-1972 indicator (0/1)
- **Type**: Numeric (integer)

### `hci`
- **Description**: Heavy and Chemical Industry (HCI) indicator (0/1)
- **Type**: Numeric (integer)

### `l_y_n`
- **Description**: Logarithm of value added per worker
- **Type**: Numeric (float)

### `l_i_n`
- **Description**: Logarithm of investment per worker
- **Type**: Numeric (float)

### `l_avg_size`
- **Description**: Logarithm of avg size
- **Type**: Numeric (float)

### `l_lab_sh`
- **Description**: Logarithm of share of total manufacturing employment
- **Type**: Numeric (float)

### `l_ship_sh`
- **Description**: Logarithm of share of total manufacturing output (shipments)
- **Type**: Numeric (float)

### `l_m_n`
- **Description**: Logarithm of intermediate input costs per worker
- **Type**: Numeric (float)

### `l_costs`
- **Description**: Logarithm of intermediate input costs
- **Type**: Numeric (float)

### `l_ship`
- **Description**: Logarithm of shipments
- **Type**: Numeric (float)

### `l_est`
- **Description**: Logarithm of number of plants
- **Type**: Numeric (float)

### `l_workers`
- **Description**: Logarithm of number of workers
- **Type**: Numeric (float)

### `l_grossoutput`
- **Description**: Logarithm of grossoutput
- **Type**: Numeric (float)

### `l_valueadded`
- **Description**: Logarithm of value added
- **Type**: Numeric (float)

### `l_ppi`
- **Description**: Logarithm of output price
- **Type**: Numeric (float)

### `l_inv_tot`
- **Description**: Logarithm of total investment
- **Type**: Numeric (float)

### `l_avg_size_0`
- **Description**: Logarithm of pre-1973 mean avg size
- **Type**: Numeric (float)

### `l_avg_wages_0`
- **Description**: Logarithm of pre-1973 mean avg wages
- **Type**: Numeric (float)

### `l_y_n_0`
- **Description**: Logarithm of pre-1973 mean value added per worker
- **Type**: Numeric (float)

### `l_costs_0`
- **Description**: Logarithm of pre-1973 mean intermediate input costs
- **Type**: Numeric (float)

### `hci_share_use_tot_0`
- **Description**: Pre-1973 mean hci share use tot
- **Type**: Numeric (float)

### `hci_share_make_tot_0`
- **Description**: Pre-1973 mean hci share make tot
- **Type**: Numeric (float)

### `lf_hci_link_use_0`
- **Description**: Pre-1973 mean forward linkage exposure to hci (leontief, pre-1973)
- **Type**: Numeric (float)

### `lf_hci_link_make_0`
- **Description**: Pre-1973 mean backward linkage exposure to hci (leontief, pre-1973)
- **Type**: Numeric (float)
